Email Security

Email Security

Reduce phishing, impersonation, account compromise, and risky inbox activity across Microsoft 365 and Google mail environments.

ACS deploys and manages Abnormal Security for Microsoft 365 and Google mail environments, reducing phishing, impersonation, account-compromise, spam, and graymail risk while managing review and response for suspicious messages.

Email security operations in a modern business environment
How ACS works
1Connect
2Analyze
3Protect
4Refine
ProtectPhishing defense
DetectImpersonation review
RespondSuspicious message handling
ManageManaged protections

Email threat filtering

Identify and reduce email risk from phishing, malicious attachments and links, spam, graymail (unwanted bulk or low-value email), business email compromise (BEC), vendor fraud, and social engineering messages that target business email users.

Abnormal Security management

Support setup, tuning, message review, and ongoing management of the Abnormal Security platform.

Account compromise awareness

Evaluate alerts tied to executive impersonation, payment-change fraud, vendor fraud, supply chain compromise, internal account compromise, and suspicious mailbox activity.

Email security that connects protection to response.

Manage email security controls for Microsoft 365 and Google environments using Abnormal SecurityFocus on phishing, malware delivery attempts, ransomware lures, social engineering, impersonation, supply chain, account compromise, spam, and graymailProvide tuning, false-positive review, reporting, and practical response workflows for suspicious email activity
Your organization’s mail environment
  • Microsoft 365 or Google connection
  • Support contacts and escalation paths
  • Safelist rules for approved senders and domains
  • End-user reporting inputs
ACS managed email security
  • Abnormal Security setup
  • Suspicious-message review
  • Platform tuning
  • Response management
  • Policy and tuning updates for protected mailboxes
ConnectAnalyzeProtectRefine
The inbox-risk gap
01

Email remains one of the easiest ways to reach employees.

Phishing, malicious attachments, credential theft, and social engineering attempts often begin in the inbox, where one convincing message can create operational disruption.

02

Modern attacks use trust, not just bad links.

Executive impersonation, vendor fraud, invoice changes, payment-change requests, supply chain compromise, and internal account compromise can look like normal business communication. Effective review has to consider sender history, relationship context, tone, timing, and whether the request makes sense.

03

Email security needs clear response paths.

ACS connects the mail environment, aligns service contacts and safelist rules, and defines how suspicious messages, account-risk alerts, user reports, and financial-change requests are reviewed and handled.

04

Trends should improve future tuning.

False positives, false negatives, repeat themes, and reported-message patterns can inform better protection, clearer user guidance, and management with security monitoring, awareness training, MFA, or incident-response workflows as the program matures.

Key capabilities

Email security for phishing defense.

Email Security

Platform connection support

Support Microsoft 365 or Google API connection, Abnormal Security setup, user-reported phish workflows, service contacts, safelist management, and protected mailbox validation.

Email Security

Phishing and malware defense

Detect, block, remove, or triage phishing, malware delivery attempts, ransomware lures, malicious links, suspicious attachments, spam, and graymail in protected mailboxes.

Email Security

Impersonation, BEC, and fraud defense

Improve behavioral detection context for executive impersonation, vendor spoofing, business email compromise, wire-fraud lures, payment-change requests, and suspicious relationship-based messages.

Email Security

Account takeover support for protected mailboxes

Manage account-compromise workflows for protected mailboxes, such as suspicious mailbox review, internal account risk triage, remediation for high-confidence ATO events, message removal, password-reset handoffs, MFA review, and user communication.

Email Security

False-positive and false-negative review

Review user-reported misses, blocked messages, false positives, false negatives, and tuning needs so protections improve over time.

Email Security

Protected mailbox reporting

Give leaders a clearer view of protected mailboxes, user-reported phish, recurring spoofing themes, payment-fraud lures, account-risk signals, tuning priorities, and next-step actions.

Common use cases

When inbox risk becomes operational.

Phishing resilience

Strengthen defenses against credential theft, malicious links, ransomware delivery, and social engineering that targets employees.

Executive impersonation

Detect and reduce risk from messages that imitate executives, finance leaders, vendors, or trusted business relationships.

Supply chain compromise

Improve context around risky vendor communications and business email patterns that may indicate a vendor or partner mailbox has been compromised.

Mailbox hygiene and reporting

Provide ongoing tuning, reporting, safelist management, and clear communication about email security controls.

How the service works

How inbox alerts become action.

01

Confirm

Document mail platform, domains, connection path, service contacts, safelist rules, reporting needs, and protected mailboxes.

02

Connect

Set up Abnormal Security for Microsoft 365 or Google environments, then validate protected mailboxes and data flow.

03

Protect

Evaluate suspicious-message alerts, manage blocked or suspicious message handling, support account-compromise workflows, and move priority issues to the right support route.

04

Refine

Tune safelists, review missed or incorrectly blocked messages, identify recurring issues, and adjust setup as business communication changes.

Next step

Need stronger inbox protection?

ACS can deploy and manage Email Security with Abnormal Security — supporting phishing defense, account-compromise review, and practical response management for Microsoft 365 and Google mail environments.

Abnormal Security managementMicrosoft 365 / Google mail protectionPhishing and impersonation focus
Acrisure Cyber Services email security consultation workspace